package enumType;
enum Signal {GREEN,YELLOW,RED}

public class TrafficLight {
	Signal color = Signal.RED;
	public void change(){
		switch(color){
		case RED: color = Signal.GREEN;
		break;
		case GREEN:color = Signal.YELLOW;
		break;
		case YELLOW:color = Signal.RED;
		break;
		}
	}
	public String toString(){
		return "The TrafficLight is "+ color;
	}
	public static void main(String[] args){
		TrafficLight trafficLight = new TrafficLight();
		for (int i = 0; i < 6; i++) {
			System.out.println(trafficLight);
			trafficLight.change();
		}
	}
}
